LCM-40KN-AUX KNX LED driver
MEAN WELL LCM-40KN-AUX is a 42 W multi-stage constant-current LED driver with KNX control, pushbutton dimming and six primary DIP current settings. Match the LED string to the selected current and voltage window; 700 mA is the factory default. This AUX version provides a 12 V / 50 mA auxiliary DC output.
Download MEAN WELL LCM-40KN Datasheet (PDF)Download MEAN WELL LCM-40/60 KNX Installation Manual
LCM catalog, PDF pages 45–53. Select the exact interface and AUX suffix when ordering.
Output and DIP settings
Output mode and rating
Constant-current output; rated power 42 W. The current and voltage limits below apply together; a family wattage does not authorize extra voltage or current.
Current accuracy and ripple
Current tolerance ±5%; maximum current ripple 5% at rated current. Ripple is measured at 50–100% of maximum output voltage and under rated power.
Current selection
DIP positions are listed as 1/2/3/4/5/6; ON and OFF refer to the marked switch positions. Select a current compatible with the LED module rating before energizing.
350 mA
LED operating window 2–100 V; maximum open-circuit voltage 110 V; DIP OFF/OFF/OFF/OFF/OFF/OFF.
500 mA
LED operating window 2–80 V; maximum open-circuit voltage 110 V; DIP ON/OFF/OFF/OFF/OFF/OFF.
600 mA
LED operating window 2–67 V; maximum open-circuit voltage 110 V; DIP ON/ON/OFF/OFF/OFF/OFF.
700 mA — default
LED operating window 2–57 V; maximum open-circuit voltage 65 V; DIP ON/ON/ON/OFF/OFF/ON.
900 mA
LED operating window 2–45 V; maximum open-circuit voltage 65 V; DIP ON/ON/ON/ON/OFF/ON.
1050 mA
LED operating window 2–40 V; maximum open-circuit voltage 65 V; DIP ON/ON/ON/ON/ON/ON.
Additional DIP settings
The following additional settings are given in the KN catalog. The connected LED forward voltage must be lower than the listed maximum. Keep the total output within the rated power; rounded table limits do not increase that rating.
450 mA — additional
Maximum LED voltage 78 V; DIP OFF/ON/OFF/OFF/OFF/OFF.
550 mA — additional
Maximum LED voltage 73 V; DIP OFF/OFF/OFF/ON/OFF/OFF.
650 mA — additional
Maximum LED voltage 62 V; DIP ON/OFF/OFF/OFF/ON/OFF.
750 mA — additional
Maximum LED voltage 53 V; DIP ON/ON/OFF/OFF/ON/ON.
800 mA — additional
Maximum LED voltage 50 V; DIP ON/ON/OFF/ON/OFF/ON.
850 mA — additional
Maximum LED voltage 47 V; DIP ON/ON/ON/OFF/ON/ON.
950 mA — additional
Maximum LED voltage 42 V; DIP ON/ON/OFF/ON/ON/ON.
Auxiliary output
AUX option: 12 V nominal (11.4–12.6 V), 50 mA, for an auxiliary load such as a fan.
Standby power
<1.2 W, measured at 180–230 VAC; AUX configuration.
Input and electrical performance
Input voltage and frequency
180–295 VAC, 47–63 Hz; 220–392 VDC.
Power factor and harmonics
Built-in active PFC. Power factor ≥0.975 at 230 VAC and ≥0.95 at 277 VAC, full load. THD <20% at load ≥75%.
Typical efficiency
90% at 500 mA / 80 V.
Typical input current
0.23 A at 230 VAC (typical).
Setup time
500 ms at 230 VAC. Measured at first cold start; repeated ON/OFF operation can increase setup time.
Inrush and breaker loading
Cold-start inrush 20 A at 230 VAC, width 310 µs at 50% Ipeak, per NEMA 410. Catalog maximum on a 16 A breaker at 230 VAC: B type 21 units / C type 35 units; assess actual circuit conditions.
Leakage current
<0.5 mA at 240 VAC.
Input/load derating
At 60 Hz: 80% load at 180 VAC, increasing to 100% at 200 VAC; the plotted full-load region continues to 295 VAC.
Control and temperature compensation
KNX configuration
ETS configuration supports switching brightness/speed/delay and status, relative/absolute dimming, lamp-failure and AC/DC monitoring, power-on level, bus-failure/recovery behavior, linear/logarithmic dimming, two block functions, staircase with multi-stage timing, cyclic monitoring, 8 scenes, an operating-hours counter, five scheduled constant-light-output (CLO) divisions and power-consumption feedback. Set output current using the hardware DIP switches; these control functions do not replace current selection.
KNX bus and PUSH
Connect a suitable KNX bus to the KNX terminals. The KNX bus must remain connected when using PUSH dimming or AC/DC monitoring. For PUSH, connect the button between PUSH and AC/L; never connect that button to AC/N, which can cause a short circuit.
PUSH grouping
Maximum button-to-last-driver cable length: 20 m. Up to 10 drivers may be controlled by one local pushbutton. ETS may define separate independent groups; this does not increase the local PUSH wiring limit.
AC/DC monitoring mode
Use the dedicated monitoring diagram: PUSH and L connect to AC/L or backup DC+, while N connects to AC/N or DC−. This is the monitoring configuration, not the PUSH-button wiring configuration.
Synchronization
Up to 10 drivers (1 master + 9 slaves); the catalog shows a KN master with LCM-40/60 slave units. Sync dimming range 6–100%; minimum dimming depends on the database. Use a flat 22–24 AWG (0.2–0.3 mm²) cable shorter than 5 m and observe SYN polarity.
External NTC temperature compensation
An external NTC across +NTC/−NTC senses the luminaire or its environment. Without an NTC, current follows the selected DIP setting. Reference THINKING TTC03 series: 220 kΩ keeps 100% current below 60°C, 330 kΩ below 70°C, or 470 kΩ below 80°C; above the corresponding threshold current is reduced according to the catalog curve. MEAN WELL does not supply the NTC; verify other brands against the curve.
NTC/control interlock
KNX control, dimming and synchronization are invalid while NTC temperature compensation is in use.
Protection and operating conditions
Protection
Short circuit: constant-current limiting with automatic recovery after the fault is removed. Overvoltage: 110–130 V, shutdown; reapply power to recover. Overtemperature: shutdown; reapply power to recover.
Case temperature
Working case-temperature range −30 to +90°C; maximum Tcase +90°C. Case temperature is not ambient temperature.
Cooling/load derating
Free-air convection, horizontal mounting. The ambient-temperature plot labels 1050 mA as full load only through +40°C, where that curve ends. The curve labelled “Others” is 100% through +50°C, falling to 60% at +60°C. Follow the matching current-setting curve; do not extrapolate beyond its endpoint. The Tcase curve is 100% through +90°C.
Altitude derating
For fanless operation above 2,000 m, reduce allowable ambient temperature by 3.5°C for each additional 1,000 m.
Humidity and storage
Operating humidity: 20–90% RH, non-condensing. Storage: −40 to +80°C, 10–95% RH.
Temperature coefficient
±0.03%/°C from 0 to +50°C.
Vibration
10–500 Hz, 2 G, 10 minutes per cycle, 60 minutes each along X, Y and Z axes.
Safety and compliance
Construction and safety
Class II plastic enclosure; no FG connection; SELV. ENEC BS EN/EN 61347-1 and 61347-2-13; BS EN/EN 62384, independent controlgear; BIS IS 15885 (Part 2/Sec 13); EAC TP TC 004. GB/T 19510.1 and GB/T 19510.213 are by request. KNX/EIB certified.
Emergency-lighting scope
Emergency-lighting (EL) requirements: BS EN/EN 50172, BS EN/EN 60598-2-22 and BS EN/EN 61347-2-13 Appendix J, with AC input 200–240 VAC.
Insulation tests
I/P–O/P: 3.75 kVAC. I/P–O/P insulation resistance >100 MΩ at 500 VDC, 25°C / 70% RH.
EMC and system integration
BS EN/EN 55015; BS EN/EN 61000-3-2 Class C (load ≥40%); BS EN/EN 61000-3-3; GB/T 17743, GB/T 17625.1; EAC TP TC 020. Immunity: BS EN/EN 61000-4-2/-3/-4/-5/-6/-8/-11 and BS EN/EN 61547, light-industry level; line-to-line surge 2 kV. These are component results; reconfirm EMC in the final equipment.
ErP installation condition
For the catalog’s latest ErP lighting-fixture compliance condition, use the driver behind a switch rather than permanently connected to mains.
Installation and reference information
Dimensions and mounting
123.5 × 81.5 × 23 mm (L × W × H), tolerance ±1 mm. Use the mounting drawing: top-view Ø4.2 mm fixing holes on 110 × 68 mm centers; the side-view tabs are marked 2 × Ø4 mm. Maintain the stated horizontal cooling orientation.
Terminal assignment
TB1: 1 AC/L, 2 AC/N, 3 PUSH. TB4: 1 KNX−, 2 KNX+. TB5: 1 +V, 2 −V. TB3: 1 +FAN, 2 −FAN, 3 +NTC, 4 −NTC, 5 +SYN, 6 −SYN. The fan/auxiliary output is active only on the AUX version.
Installation
Disconnect power before wiring or changing DIP settings. Match LED polarity and the complete current/voltage/power envelope, and use the exact terminal diagram for this interface. Apply the installation instructions in the linked manual.
Per-unit weight reference
240 g (0.24 kg), the catalog PACKING reference per unit; not a shipment weight.
Reliability and warranty
MTBF 1764.6K / 190.4K hours, respectively Telcordia SR-332 / MIL-HDBK-217F at 25°C. Manufacturer catalog warranty: 3 years, subject to its terms.
Specification conditions
Unless otherwise stated, parameters are measured at 230 VAC input, rated current and 25°C ambient. Performance plots use Tcase 80°C; the plotted examples do not replace the model limits.
Manufacturer installation instructions
Installation and clearance
Install indoors by a qualified electrician. Keep at least 50 mm of ventilation clearance around the driver. Follow the dedicated installation manual and the model-specific load and temperature derating limits.
LED load connection
Do not connect a DC/DC converter or constant-current driver between this driver and the LED load. The selected output voltage and total output power must remain within the rated limits.
Ambient installation limit
The dedicated installation manual limits ambient temperature to 60°C. This is separate from the case-temperature rating; also obey the current model-specific load derating curve.
Connection sequence
Connect the LED lamps before applying AC power to avoid LED damage.
PUSH button specification
Use only a normally open pushbutton without an indicator light. Follow the model-specific PUSH-to-line diagram; never wire the PUSH button to neutral.
Push-terminal wiring
For AC input, LED output and the applicable PUSH/DALI push terminals, the manual specifies 14–18 AWG stranded wire, 0.823–2.08 mm², or solid-wire diameter 1.024–1.628 mm. Strip 10 mm. Suggested push-down force 3–4 kp (6.61–8.81 lbf); no screw-tightening torque is specified for these push terminals.
Small screw-terminal wiring
For the fitted FAN/NTC/SYNC screw terminals: 22–26 AWG stranded wire, 0.129–0.326 mm², or solid-wire diameter 0.404–0.643 mm; strip 7 mm. Use a 3 mm Phillips screwdriver; recommended tightening torque 2.88 kgf·cm (2.5 lbf·in). Apply these values only to the fitted small screw terminals, not the mains/output push terminals or the KNX bus connector.
Cover and tools
The manual specifies a 6 mm Phillips screwdriver and 4.6 kgf·cm (4 lbf·in) for the cover screws. Its terminal-tool table specifies a 3 mm Phillips screwdriver; the connection drawing shows pressing the release button with a slotted screwdriver to insert/remove the wire. Use a suitable tool for the actual release mechanism.
KNX commissioning
Obtain the application database through ETS Online Catalogs or the manufacturer’s product catalog. Configure the actual KNX system and observe bus polarity. The current driver catalog specifies 220–392 VDC input; the older installation manual’s 220–417 VDC headline does not extend that limit.
Circuit-breaker reference
Maximum units on a 230 VAC breaker according to the installation manual: B10: 13; B16: 21; C10: 22; C16: 35. These are calculated references for ABB S201 miniature circuit breakers; select protection for the actual installation.
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